PR libstdc++/89023 fix test that fails when <omp.h> not available

Instead of a single test that only checks whether <regex> can be
included in Parallel Mode, add tests for each of C++11/C++14/C++17 that
check whether <bits/extc++.h> is compatible with _GLIBCXX_PARALLEL.
This increases the coverage to (almost) all headers.

If <omp.h> is not available then the tests will trivially pass, because
we don't care about compatibility with _GLIBCXX_PARALLEL in that case.

	PR libstdc++/89023
	* testsuite/17_intro/headers/c++2011/parallel_mode.cc: New test.
	* testsuite/17_intro/headers/c++2014/parallel_mode.cc: New test.
	* testsuite/17_intro/headers/c++2017/parallel_mode.cc: New test.
	* testsuite/28_regex/headers/regex/parallel_mode.cc: Remove.

From-SVN: r268769

libstdc++-v3/ChangeLog

+2019-02-11  Jonathan Wakely  <jwakely@redhat.com>
+
+	PR libstdc++/89023
+	* testsuite/17_intro/headers/c++2011/parallel_mode.cc: New test.
+	* testsuite/17_intro/headers/c++2014/parallel_mode.cc: New test.
+	* testsuite/17_intro/headers/c++2017/parallel_mode.cc: New test.
+	* testsuite/28_regex/headers/regex/parallel_mode.cc: Remove.
+
 2019-02-09  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/71044

libstdc++-v3/testsuite/28_regex/headers/regex/parallel_mode.cc → libstdc++-v3/testsuite/17_intro/headers/c++2011/parallel_mode.cc

-// Copyright (C) 2018-2019 Free Software Foundation, Inc.
+// Copyright (C) 2019 Free Software Foundation, Inc.
 //
 // This file is part of the GNU ISO C++ Library.  This library is free
 // software; you can redistribute it and/or modify it under the
@@ -15,8 +15,11 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
+// { dg-options "-std=gnu++11" }
 // { dg-do compile { target c++11 } }
 // { dg-require-normal-mode "" }
 
-#define _GLIBCXX_PARALLEL
-#include <regex>
+#if __has_include(<omp.h>)
+# define _GLIBCXX_PARALLEL 1
+# include <bits/extc++.h>
+#endif

libstdc++-v3/testsuite/17_intro/headers/c++2014/parallel_mode.cc

+// Copyright (C) 2019 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++14" }
+// { dg-do compile { target c++14 } }
+// { dg-require-normal-mode "" }
+
+#if __has_include(<omp.h>)
+# define _GLIBCXX_PARALLEL 1
+# include <bits/extc++.h>
+#endif

libstdc++-v3/testsuite/17_intro/headers/c++2017/parallel_mode.cc

+// Copyright (C) 2019 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++17" }
+// { dg-do compile { target c++17 } }
+// { dg-require-normal-mode "" }
+
+#if __has_include(<omp.h>)
+# define _GLIBCXX_PARALLEL 1
+# include <bits/extc++.h>
+#endif